Machine for truing crusher rolls



Aug. 7, w23. 1,464.04@

J.WCHARDSON MACHINE FOR TRUING CRUSHER ROLLS Filed Feb. 8. 1922 2Sheets-Shea?l l eiwit/wma MACHINE FOR vTRUING CRUSHER ROLLS Filed Feb.8. 1922 2 Sheets-Sheetl 2 oem/tor Patented Ang., L 19Z3 U l T E S JOSEPHRICHARDSON, OF`BRISTOL, VERMONT, ASSGNOR TO FREDERICK LADUE,`OF BRISTOL,VER-MONT.

MACHINE FOR TRUING CRSHER ROLLS.

Application led February 8, 1922. Serial No. 534,884.

To all 'whom t may concern.

Be it known that l, Josnrn RICHARDSON, a citizen of the United States,residing at Bristol, in the county, of Addison and State of Vermont,have invented certain new and useful Improvements in Machines for TruingCrusher Rolls; and I dordeclare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to an improved machine which is especially,although not necessarily, designed for truing and grinding the surfacesof'rollers such as are used in stone crushing machines, the same beingdesigned to permit such worlr to be accomplished without necessitatingthe removal of the rollers from the crushing machine.

Here, it maybe stated that these crusher rolls, between, which the rockto be ground is passed, become pitted' and their surfaces thus rendered:very uneven after a short time in use and it therefore becomesnecessary to grind'their surfaces to put them in condition for furthereffective use. It is customary at this time to remove the rollers fromthe crushing machine, and as these rollers are extremely heavy inweight, weighing as much as several tons, considerable labor, timeandexpenseis involved in accomplishing the task. Furthermore, themachines are put out of use and-` additional time `is lost during' thetime the rollers are taken from the mill to the repairl shop to begroundA by use of a lathe. In view of these circumstances, the `aboveprocedure is eX- tremely expensive to the owner.

In view of the foregoingcircumstances, I have' devised an extremelysimple and effectivemachinefor attachment to the trough ofthe stonecrusher'which will effectively and accurately grind and'true thesurfaces of ythe crusher rolls withoutnecessitating the removal ofV thelatter. Hence, much time, labor. and expense is saved.

The invention further aims to provide a machineof this class which is animprovement'over prior patentedand marketed machinesifor'accomplishing asimilar end, the sameembodyin a horizontally shiftable andverticallytiltab e `carrier arm for the grinding elementwhichA is somounted thatit can bequickly and easily positioned for use and readily".moved back, and forth in a horizontal manner to effectively remove allirregularities from the surface of the rollers.

Other objects, advantages, features and constructional differences ofthis invention will be apparent as the descriptiongoes on.

ln the accompanying drawings forming a part of this specification inwhich like numerals are employed to designate like parts throughout thesame:

Figure l is a perspective view of'a machine constructed in accordancewith this invention showing the same mounted on the trough of the stonecrusher.

`Figure 2 is a sectional view taken through the lower portion of themachineshowing the grinding element engaged Awith one of the Crusherrolls.

F i ure 3 is a central longitudinal sectiona view taken substantially onthe plane of the line 3-3 of Fig. 2.

Briefly described, the invention comprises a structure adjustablymounted on-a pair of guides secured to a base which, in this instance,is the trough of a stone crushing machine. This structure embodies ahorizontally movable and vertically tiltablearm, which has at its outerend, suitable grinding means for engagement with the `surface of theCrusher rolls, said means being driven in any suitable way. ln additionto these parts, there is a feed screw, which serves, through themediumof a horizontally movable block, to move the arm back and forth in ahorizontal manner. Thisbloclr is cooperative with a belt shifting devicewhich embodies means for automatically reversing the direction ofmovement of the arm after the latter has moved a pre-determineddistance, thus automatically controlling the movementofthe arm. Otherparts and details are shown but need not be mentioned at this time.

Referring to the drawings by numerals, l designates a pair of upstandingduplicate frames of suitable formation whichare arranged in spacedrelationship-on one end of the trough 2 of a stone crushing machine. Theframes 1 may be connectedwith the crushing machine in any suitable way.However, they are preferably connected by means which is such that itpermits them to be moved closer to or further from the rolls 3. Thepreferredconstruction for accomplishing this comprises a plurality ofsubstantially tfshaped brackets 4L which are detachably connected withthe trough 2 in any suitable way. These brackets are arranged oppositeone another and the adjacent ones are disposed in spaced relation. Theupstanding portions thereof are formed with elongated slots 5 in whichbinding elements 6 have vertical movement. The means under considerationfurther comprises a pair of substantially rectangular bars 7 which haveOppositely disposed guide grooves 8 formed in their inner surfaces inwhich the laterally directed lower ends 9 of the frames are slidablyreceived. Set screws or any other suitable means 10 may be employed forholding the frames invarious set positions. At their upper ends, theframes are provided with horizontal bearings 11, in which a shaft 12 isrotatably mounted, the latter carrying elongated pulleys 13 and 14,which serve purposes to be hereinafter set forth. Referring n-ow to thelower portion of the frames, it will be seen that each of the legs ofthe latter carriesk rods 15 and 16, the last named of which ispositioned at a lower elevation than the first named one. A carrier arm17 is provided intermediate its ends with a bearing 18 slidably mountedon the rod 16. Here, I may state, that this bearing may be formed in anysuitable way, preferably including a removable plate 19 which serves topermit the arm to be removed from the rodrl6 and replaced wheneverdesired. It is to be noted that this bearing is such that it permits thearm to be tilted in -a vertical manner. A slide 2O of any suitableconstruction, is mounted for horizontal movement on the rod 15, the samebeing equipped with upstanding spaced lugs 21 between which the rear endof the arm 17 is received.

f It is desirable to provide means for tilting the arm and insuringeffective engagement of the grinding element with the Crusher rolls 3.While some other construction may be used for accomplishing this end, Iprefer to employ a thumb-screw 22, the latter being movable through ascrewthreaded opening in the slide 20 and having swivel connection withthe under face of the arm 17 as indicated at 23. In addil tion to thisscrew, I also contemplate using -a set screw 24 which is carried by thearm and has its lower end resting on the slide 20 as better shown inFigure 3. It is obvious that by properly manipulating these screws, theangularity 0f the arm can be easily and readily varied.

Referring now to the outer end of the tilting arm 17, it will be seenthat it is equipped with spaced bearings25 in which the shaft 26 of acarborundum grinding disk 27 is journalled. Arranged between thebearings and on the shaft 26 is a small pul ley 28 driven by a belt 29which is in turn driven by the pulley 13, the latter receiving movementfrom the belt 30. Here, it may be mentioned that it is of courseunderstood that the belt 29 has suflicient slack to permit propertilting of the arm.

It has been before intimated that the machine embodies means forimparting a horizontal continuous movement to the arm and `grindingelement. In carrying this` out, I dispose a feed screw 31 between theframes 1 in the manner shown, the right-hand end of this screw extendingbeyond the adjacent fra-me and carrying a plurality of pulleys 32, theouter ones of which rotate with the screw and the intermediate one ofwhich is loosely mounted on the latter to act somewhat like an idler.Two belts 33 and 34 are associated with these pulleys and with theelongated pulley 14, the belt 33 being straight as shownV while theremaining one is twisted or crossed to rotate the screw in a directionopposite to that in which it is rotatedfby the belt 33. A. shifting rod35 for these belts is positioned above the screw 31 and. is carried bytheI frames 1. This rod 35 is freely movable through the bearingopenings in the frames and carries depending adjustable stops 36. t willbe seen that these stops are designed to be engaged by the extension 37of the horizontal travelling head or block l 38 mounted on the feedscrew 31. When the stops are so engaged, they impart a sliding movementto the belt and shifting rod 35 and the latter through its connections40,

with the belts 33 and 34 `serves to place the latter on the properpulley 32 to reverse the direction of movement of the arm 1 7 after thelatter has travelled a pre-determined distance in one direction. It isyet to be pointed out that the block 38 has detachable connection withthe arm 17 through the medium of the depending extension 39. Inoperation, it will be seen that the frames and parts which they carrywill be properly adjusted in the guide grooves 8 of the supporting meansto position the guiding means at the proper distance from the Crusherrolls 3. When the belt 30 is set into motion7 the remaining belts willlikewise be set `into motion and the grinding element 27 will be rotatedagainst thek Crusher roll, at the same time the feed screw 31 will berotated ,and the arm 17 will be carried from left to right or in anopposite direction as the case may be. Assuming that the stops 36 havebeen set in proper position, it will be seen that as soon as theextension 37 engages one of these it will move the belt shifting rod 35in such a way as to automatically shift the belts 33 and 34 onto theproper pulleys 33, thus All() automatically reversing the direction ofAs before indicated, by properly manipulat-` ing the screws 22 and 24C,the arm 17 can be tilted to the desired degree to insure effectiveengagement of the grinding disk with the crusher rolls.

A careful consideration of the foregoing description taken in connectionwith the accompanying drawings will be suiiicient to enable personsskilled in the art to which the invention relates to obtain a clearunderstanding of the same. Therefore, a more lengthy description isdeemed unnecessary.

Advantageous and effective results are practically insured with theconstruction and arrangement herein shown and described. However, slightminor changes coming within the scope of the subjoined claims may beresorted t0.

I claim:

l. A device of the class described comprising a. pair of spacedupstanding frames, a pair of horizontally disposed rods connected to andextending between the frames, an arm having a bearing intermediate itsends through which one of said rods extends and on which the arm ishorizontally slidable and vertically tiltable, a rotary grinding elementcarried by said arm, means for actuating said element, means forimparting horizontal movement to said arm and co-acting means betweenthe latter and remaining rod to adjust the arm.

2. A device of the class described coinprising a pair of upstandingframes arranged in spaced relation, front and rear horizontally disposedrods arranged between and connected tosaid frames, a vertically tiltingand horizontally movable arm provided intermediate its ends with abearing loosely and slidably mounted on said 3. A machine for truingycrusher rolls and the like comprising apair of brackets, bars secured tosaid brackets, said bars having guide grooves in their inner opposedfaces, upstanding frames having their laterally directed lower endsslidably received in the grooves in said bars,y horizontally disposedforward and rear rods connected to and extending between the frames, aAfeed screw disposed above and also extending between the frames, acarrier arm extending crosswise of said rods, said arm being providedintermediate its ends with a bearing slidable on the)` forward rod, agrinding element rotatably mounted on the outer free end of said arm, aslide arranged on said rear rod, an adjusting screw passing through saidslide and having connection with said arm for tilting the latter, adriving connection between the intermediate portion of the arm and saidfeed screw, and means for actuating the latter and' the aforesaidgrinding element.

4. A device of the class described comprising a base, spaced bracketssecured thereto, bars detachably and adjustably connected to saidbrackets, having guide grooves in their inner opposed faces7 frameshaving laterally turned lower ends slidably received in said grooves,and adjustable grinding means supported on said frames.

In testimony whereof I have hereunto set my hand.

JOSEPH RICHARDSON.

